Ragazzi sapreste dirmi perchè non funziona questa sempliccisma pagina (con Internet Explorer)? :master:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Documento senza titolo</title>
</head>

<body>
<script language="javascript" type="text/javascript">
<!--
function scrolla(){
if (document.all && !window.opera) y_scroll=document.body.scrollTop; else y_scroll=self.pageYOffset;
document.forms['pos'].elements['top_pos'].value = y_scroll;
}
-->
</script>
<div style="height:1000px ">ciao</div>
<form name="pos" id="pos">
Scroll TOP: <input type="text" name="top_pos" id="top_pos" size="2">
<input type="button" value="ok" onClick="scrolla();">
</form>
<div style="height:1000px ">ciao</div>
</body>
</html>